Split useful code into separate Source object.

4 files changed, 591 insertions, 484 deletions

diff --git a/lib/Makefile.am b/lib/Makefile.am
index 169a2de0..cdf41ba2 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -7,6 +7,7 @@ AM_VALAFLAGS = --enable-experimental-non-null   \
                --vapidir $(top_srcdir)/deps
 
 indicator_keyboard_service_SOURCES = main.vala   \
+                                     source.vala \
                                      common.vala
 indicator_keyboard_service_VALAFLAGS = $(AM_VALAFLAGS)         \
                                        --pkg gee-1.0           \
diff --git a/lib/common.vala b/lib/common.vala
index 4d8b9add..9824bc26 100644
--- a/lib/common.vala
+++ b/lib/common.vala
@@ -16,18 +16,22 @@
  * Authors: William Hua <william.hua@canonical.com>
  */
 
-string get_abbreviation (string name) {
+string? abbreviate (string? name) {
 	var index = 0;
 	unichar first;
 	unichar second;
 
-	if (name.get_next_char (ref index, out first)) {
-		if (name.get_next_char (ref index, out second)) {
-			return @"$((!) first.toupper ().to_string ())$((!) second.to_string ())";
+	if (name != null) {
+		if (((!) name).get_next_char (ref index, out first)) {
+			if (((!) name).get_next_char (ref index, out second)) {
+				return @"$((!) first.toupper ().to_string ())$((!) second.to_string ())";
+			} else {
+				return first.toupper ().to_string ();
+			}
 		} else {
-			return (!) first.toupper ().to_string ();
+			return "";
 		}
 	} else {
-		return "";
+		return null;
 	}
 }
diff --git a/lib/main.vala b/lib/main.vala
index 5fb251dd..91466f8c 100644
--- a/lib/main.vala
+++ b/lib/main.vala
@@ -19,78 +19,79 @@
 [DBus (name = "com.canonical.indicator.keyboard")]
 public class Indicator.Keyboard.Service : Object {
 
+	private static IBus.Bus? ibus;
+
+	private bool force;
 	private bool use_gtk;
 	private bool use_bamf;
+
 	private MainLoop? loop;
 	private Settings indicator_settings;
 	private Settings source_settings;
 	private Settings per_window_settings;
-	private Gnome.XkbInfo xkb_info;
-	private IBus.Bus? ibus;
 	private Bamf.Matcher? matcher;
 	private Gee.HashMap<string, uint>? window_sources;
 
+	private Source[]? sources;
+
 	private SimpleActionGroup? action_group;
 	private SimpleAction? indicator_action;
 	private MenuModel? menu_model;
 	private Menu? sources_menu;
 
-	private Icon?[]? icons;
-	private string[]? icon_strings;
-	private int[]? icon_string_uniques;
-	private uint[]? icon_string_subscripts;
-
 	[DBus (visible = false)]
 	public Service (ref unowned string[] args) {
-		Bus.own_name (BusType.SESSION,
-		              "com.canonical.indicator.keyboard",
-		              BusNameOwnerFlags.ALLOW_REPLACEMENT | ("--force" in args ? BusNameOwnerFlags.REPLACE : 0),
-		              this.handle_bus_acquired,
-		              null,
-		              this.handle_name_lost);
-
-		this.use_gtk = "--use-gtk" in args;
-		this.use_bamf = "--use-bamf" in args;
+		force = "--force" in args;
+		use_gtk = "--use-gtk" in args;
+		use_bamf = "--use-bamf" in args;
 
-		if (this.use_gtk) {
-			this.use_gtk = Gtk.init_check (ref args);
+		if (use_gtk) {
+			use_gtk = Gtk.init_check (ref args);
 		} else {
 			Gdk.init (ref args);
 		}
 
-		this.indicator_settings = new Settings ("com.canonical.indicator.keyboard");
-		this.indicator_settings.changed["visible"].connect (this.handle_changed_visible);
-
-		this.source_settings = new Settings ("org.gnome.desktop.input-sources");
-		this.source_settings.changed["current"].connect (this.handle_changed_current);
-		this.source_settings.changed["sources"].connect (this.handle_changed_sources);
+		indicator_settings = new Settings ("com.canonical.indicator.keyboard");
+		indicator_settings.changed["visible"].connect (handle_changed_visible);
 
-		this.per_window_settings = new Settings ("org.gnome.libgnomekbd.desktop");
-		this.per_window_settings.changed["group-per-window"].connect (this.handle_changed_group_per_window);
+		source_settings = new Settings ("org.gnome.desktop.input-sources");
+		source_settings.changed["current"].connect (handle_changed_current);
+		source_settings.changed["sources"].connect (handle_changed_sources);
 
-		this.xkb_info = new Gnome.XkbInfo ();
+		per_window_settings = new Settings ("org.gnome.libgnomekbd.desktop");
+		per_window_settings.changed["group-per-window"].connect (handle_changed_group_per_window);
 
 		migrate_keyboard_layouts ();
-
 		update_window_sources ();
-
-		this.loop = new MainLoop ();
-		((!) this.loop).run ();
+		acquire_bus_name ();
 	}
 
 	[DBus (visible = false)]
-	private IBus.Bus get_ibus () {
-		if (this.ibus == null) {
+	private static IBus.Bus get_ibus () {
+		if (ibus == null) {
 			IBus.init ();
-			this.ibus = new IBus.Bus ();
+			ibus = new IBus.Bus ();
 		}
 
-		return (!) this.ibus;
+		return (!) ibus;
+	}
+
+	[DBus (visible = false)]
+	private void acquire_bus_name () {
+		Bus.own_name (BusType.SESSION,
+		              "com.canonical.indicator.keyboard",
+		              BusNameOwnerFlags.ALLOW_REPLACEMENT | (force ? BusNameOwnerFlags.REPLACE : 0),
+		              handle_bus_acquired,
+		              null,
+		              handle_name_lost);
+
+		loop = new MainLoop ();
+		((!) loop).run ();
 	}
 
 	[DBus (visible = false)]
 	private void migrate_keyboard_layouts () {
-		if (!this.indicator_settings.get_boolean ("migrated")) {
+		if (!indicator_settings.get_boolean ("migrated")) {
 			var builder = new VariantBuilder (new VariantType ("a(ss)"));
 			var length = 0;
 
@@ -139,26 +140,26 @@ public class Indicator.Keyboard.Service : Object {
 				}
 			}
 
-			this.source_settings.set_value ("sources", builder.end ());
+			source_settings.set_value ("sources", builder.end ());
 
-			this.indicator_settings.set_boolean ("migrated", true);
+			indicator_settings.set_boolean ("migrated", true);
 		}
 	}
 
 	[DBus (visible = false)]
 	private void update_window_sources () {
-		if (this.use_bamf) {
-			var group_per_window = this.per_window_settings.get_boolean ("group-per-window");
+		if (use_bamf) {
+			var group_per_window = per_window_settings.get_boolean ("group-per-window");
 
-			if (group_per_window != (this.window_sources != null)) {
+			if (group_per_window != (window_sources != null)) {
 				if (group_per_window) {
-					this.window_sources = new Gee.HashMap<string, uint> ();
-					this.matcher = Bamf.Matcher.get_default ();
-					((!) this.matcher).active_window_changed.connect (this.handle_active_window_changed);
+					window_sources = new Gee.HashMap<string, uint> ();
+					matcher = Bamf.Matcher.get_default ();
+					((!) matcher).active_window_changed.connect (handle_active_window_changed);
 				} else {
-					((!) this.matcher).active_window_changed.disconnect (this.handle_active_window_changed);
-					this.matcher = null;
-					this.window_sources = null;
+					((!) matcher).active_window_changed.disconnect (handle_active_window_changed);
+					matcher = null;
+					window_sources = null;
 				}
 			}
 		}
@@ -172,312 +173,74 @@ public class Indicator.Keyboard.Service : Object {
 	[DBus (visible = false)]
 	private void handle_active_window_changed (Bamf.View? old_view, Bamf.View? new_view) {
 		if (old_view != null) {
-			((!) this.window_sources)[((!) old_view).path] = this.source_settings.get_uint ("current");
+			((!) window_sources)[((!) old_view).path] = source_settings.get_uint ("current");
 		}
 
 		if (new_view != null) {
-			if (!((!) this.window_sources).has_key (((!) new_view).path)) {
-				var default_group = this.per_window_settings.get_int ("default-group");
+			if (!((!) window_sources).has_key (((!) new_view).path)) {
+				var default_group = per_window_settings.get_int ("default-group");
 
 				if (default_group >= 0) {
-					this.source_settings.set_uint ("current", (uint) default_group);
+					source_settings.set_uint ("current", (uint) default_group);
 				}
 			} else {
-				this.source_settings.set_uint ("current", ((!) this.window_sources)[((!) new_view).path]);
-			}
-		}
-	}
-
-	[DBus (visible = false)]
-	private Gtk.StyleContext? get_style_context () {
-		Gtk.StyleContext? context = null;
-
-		if (this.use_gtk) {
-			Gdk.Screen? screen = Gdk.Screen.get_default ();
-
-			if (screen != null) {
-				context = new Gtk.StyleContext ();
-				((!) context).set_screen ((!) screen);
-
-				var path = new Gtk.WidgetPath ();
-				path.append_type (typeof (Gtk.MenuItem));
-				((!) context).set_path (path);
-			}
-		}
-
-		return context;
-	}
-
-	[DBus (visible = false)]
-	protected virtual Icon? create_icon (string? text, uint subscript) {
-		Icon? icon = null;
-
-		var style = get_style_context ();
-
-		if (style != null) {
-			const int W = 22;
-			const int H = 22;
-			const int w = 20;
-			const int h = 20;
-			const double R = 2.0;
-			const double TEXT_SIZE = 12.0;
-			const double SUBSCRIPT_SIZE = 8.0;
-
-			Pango.FontDescription description;
-			var colour = ((!) style).get_color (Gtk.StateFlags.NORMAL);
-			colour = { 0.5, 0.5, 0.5, 1.0 };
-			((!) style).get (Gtk.StateFlags.NORMAL, Gtk.STYLE_PROPERTY_FONT, out description);
-
-			var surface = new Cairo.ImageSurface (Cairo.Format.ARGB32, W, H);
-			var context = new Cairo.Context (surface);
-
-			context.translate (0.5 * (W - w), 0.5 * (H - h));
-
-			context.new_sub_path ();
-			context.arc (R, R, R, Math.PI, -0.5 * Math.PI);
-			context.arc (w - R, R, R, -0.5 * Math.PI, 0);
-			context.arc (w - R, h - R, R, 0, 0.5 * Math.PI);
-			context.arc (R, h - R, R, 0.5 * Math.PI, Math.PI);
-			context.close_path ();
-
-			context.set_source_rgba (colour.red, colour.green, colour.blue, colour.alpha);
-			context.fill ();
-			context.set_operator (Cairo.Operator.CLEAR);
-
-			if (text != null) {
-				var text_layout = Pango.cairo_create_layout (context);
-				text_layout.set_alignment (Pango.Alignment.CENTER);
-				description.set_absolute_size (Pango.units_from_double (TEXT_SIZE));
-				text_layout.set_font_description (description);
-				text_layout.set_text ((!) text, -1);
-				Pango.cairo_update_layout (context, text_layout);
-				int text_width;
-				int text_height;
-				text_layout.get_pixel_size (out text_width, out text_height);
-
-				if (subscript > 0) {
-					var subscript_layout = Pango.cairo_create_layout (context);
-					subscript_layout.set_alignment (Pango.Alignment.CENTER);
-					description.set_absolute_size (Pango.units_from_double (SUBSCRIPT_SIZE));
-					subscript_layout.set_font_description (description);
-					subscript_layout.set_text (@"$subscript", -1);
-					Pango.cairo_update_layout (context, subscript_layout);
-					int subscript_width;
-					int subscript_height;
-					subscript_layout.get_pixel_size (out subscript_width, out subscript_height);
-
-					context.save ();
-					context.translate ((w - (text_width + subscript_width)) / 2, (h - text_height) / 2);
-					Pango.cairo_layout_path (context, text_layout);
-					context.fill ();
-					context.restore ();
-
-					context.save ();
-					context.translate ((w + (text_width - subscript_width)) / 2, (h + text_height) / 2 - subscript_height);
-					Pango.cairo_layout_path (context, subscript_layout);
-					context.fill ();
-					context.restore ();
-				} else {
-					context.save ();
-					context.translate ((w - text_width) / 2, (h - text_height) / 2);
-					Pango.cairo_layout_path (context, text_layout);
-					context.fill ();
-					context.restore ();
-				}
-			}
-
-			var buffer = new ByteArray ();
-
-			surface.write_to_png_stream ((data) => {
-				buffer.append (data);
-				return Cairo.Status.SUCCESS;
-			});
-
-			icon = new BytesIcon (ByteArray.free_to_bytes ((owned) buffer));
-		}
-
-		return icon;
-	}
-
-	[DBus (visible = false)]
-	private string get_icon_string (uint index) {
-		string? icon_string = null;
-
-		if (this.icon_strings == null) {
-			var array = this.source_settings.get_value ("sources");
-			this.icon_strings = new string[array.n_children ()];
-		}
-
-		if (index < ((!) this.icon_strings).length) {
-			icon_string = this.icon_strings[index];
-
-			if (icon_string == null) {
-				var array = this.source_settings.get_value ("sources");
-
-				string type;
-				string name;
-
-				array.get_child (index, "(ss)", out type, out name);
-
-				if (type == "xkb") {
-					string? short_name;
-
-					this.xkb_info.get_layout_info (name, null, out short_name, null, null);
-
-					if (short_name != null) {
-						this.icon_strings[index] = get_abbreviation ((!) short_name);
-						icon_string = this.icon_strings[index];
-					}
-				}
+				source_settings.set_uint ("current", ((!) window_sources)[((!) new_view).path]);
 			}
 		}
-
-		if (icon_string == null) {
-			icon_string = "";
-		}
-
-		return (!) icon_string;
 	}
 
 	[DBus (visible = false)]
-	private bool is_icon_string_unique (uint index) {
-		bool icon_string_unique = true;
-
-		if (this.icon_string_uniques == null) {
-			var array = this.source_settings.get_value ("sources");
-			this.icon_string_uniques = new int[array.n_children ()];
+	private Source[] get_sources () {
+		if (sources == null) {
+			var array = source_settings.get_value ("sources");
 
-			for (var i = 0; i < ((!) this.icon_string_uniques).length; i++) {
-				this.icon_string_uniques[i] = -1;
-			}
-		}
+			sources = new Source[array.n_children ()];
 
-		if (index < ((!) this.icon_string_uniques).length) {
-			if (this.icon_string_uniques[index] == -1) {
-				this.icon_string_uniques[index] = 1;
+			for (var i = 0; i < ((!) sources).length; i++) {
+				sources[i] = new Source(array.get_child_value (i), use_gtk);
+				sources[i].show_subscript = false;
+				sources[i].subscript = 1;
 
-				var icon_string = get_icon_string (index);
+				for (var j = (int) i - 1; j >= 0; j--) {
+					if ((!) sources[j].short_name == (!) sources[i].short_name) {
+						sources[i].subscript = sources[j].subscript + 1;
+						sources[i].show_subscript = true;
+						sources[j].show_subscript = true;
 
-				for (var i = 0; i < ((!) this.icon_string_uniques).length && this.icon_string_uniques[index] == 1; i++) {
-					if (i != index && get_icon_string (i) == icon_string) {
-						this.icon_string_uniques[index] = 0;
+						break;
 					}
 				}
 			}
-
-			icon_string_unique = this.icon_string_uniques[index] != 0;
 		}
 
-		return icon_string_unique;
+		return (!) sources;
 	}
 
 	[DBus (visible = false)]
-	private uint get_icon_string_subscript (uint index) {
-		uint icon_string_subscript = 0;
-
-		if (this.icon_string_subscripts == null) {
-			var array = this.source_settings.get_value ("sources");
-			this.icon_string_subscripts = new uint[array.n_children ()];
-		}
-
-		if (index < ((!) this.icon_string_subscripts).length) {
-			icon_string_subscript = this.icon_string_subscripts[index];
-
-			if (icon_string_subscript == 0) {
-				this.icon_string_subscripts[index] = 1;
-
-				for (var i = (int) index - 1; i >= 0 && this.icon_string_subscripts[index] == 1; i--) {
-					if (get_icon_string (i) == get_icon_string (index)) {
-						this.icon_string_subscripts[index] = get_icon_string_subscript (i) + 1;
-					}
-				}
+	private void update_indicator_action () {
+		var visible = indicator_settings.get_boolean ("visible");
+		var current = source_settings.get_uint ("current");
+		var icon = get_sources ()[current].icon;
+		Variant state;
 
-				icon_string_subscript = this.icon_string_subscripts[index];
-			}
+		if (icon != null) {
+			state = new Variant.parsed ("{ 'visible' : <%b>, 'icon' : %v }", visible, ((!) icon).serialize ());
+		} else {
+			state = new Variant.parsed ("{ 'visible' : <%b> }", visible);
 		}
 
-		return icon_string_subscript;
+		get_indicator_action ().set_state (state);
 	}
 
 	[DBus (visible = false)]
-	private Icon? get_icon (uint index) {
-		Icon? icon = null;
-
-		if (this.icons == null) {
-			var array = this.source_settings.get_value ("sources");
-			this.icons = new Icon?[array.n_children ()];
-		}
-
-		if (index < ((!) this.icons).length) {
-			icon = this.icons[index];
-
-			if (icon == null) {
-				var array = this.source_settings.get_value ("sources");
-
-				string type;
-				string name;
-
-				array.get_child (index, "(ss)", out type, out name);
-
-				if (type == "xkb") {
-					var icon_string = get_icon_string (index);
-					var icon_unique = is_icon_string_unique (index);
-					var icon_subscript = get_icon_string_subscript (index);
-
-					if (icon_string.get_char () != '\0') {
-						string icon_name;
-
-						if (icon_unique) {
-							icon_name = @"indicator-keyboard-$((!) icon_string)";
-						} else {
-							icon_name = @"indicator-keyboard-$((!) icon_string)-$icon_subscript";
-						}
-
-						if (this.use_gtk) {
-							var icon_theme = Gtk.IconTheme.get_default ();
-							Gtk.IconInfo? icon_info = icon_theme.lookup_icon (icon_name, 22, 0);
-
-							if (icon_info != null) {
-								try {
-									this.icons[index] = Icon.new_for_string (((!) icon_info).get_filename ());
-								} catch (Error error) {
-									this.icons[index] = null;
-								}
-							}
-						} else {
-							this.icons[index] = new ThemedIcon (icon_name);
-						}
-					}
-
-					if (this.icons[index] == null) {
-						if (icon_unique) {
-							this.icons[index] = create_icon (icon_string, 0);
-						} else {
-							this.icons[index] = create_icon (icon_string, icon_subscript);
-						}
-					}
-				} else if (type == "ibus") {
-					var names = new string[2];
-					names[0] = name;
-
-					var engines = get_ibus ().get_engines_by_names (names);
-
-					if (engines.length > 0) {
-						var engine = engines[0];
-
-						try {
-							this.icons[index] = Icon.new_for_string (engine.get_icon ());
-						} catch (Error error) {
-							warning ("error: %s", error.message);
-						}
-					}
-				}
-
-				icon = this.icons[index];
-			}
+	private SimpleAction get_indicator_action () {
+		if (indicator_action == null) {
+			var state = new Variant.parsed ("{ 'visible' : <false> }");
+			indicator_action = new SimpleAction.stateful ("indicator", null, state);
+			update_indicator_action ();
 		}
 
-		return icon;
+		return (!) indicator_action;
 	}
 
 	[DBus (visible = false)]
@@ -485,57 +248,66 @@ public class Indicator.Keyboard.Service : Object {
 		var group = new SimpleActionGroup ();
 
 		group.insert (root_action);
-		group.insert (this.source_settings.create_action ("current"));
+		group.insert (source_settings.create_action ("current"));
 
 		var action = new SimpleAction ("map", null);
-		action.activate.connect (this.handle_activate_map);
+		action.activate.connect (handle_activate_map);
 		group.insert (action);
 
 		action = new SimpleAction ("chart", null);
-		action.activate.connect (this.handle_activate_chart);
+		action.activate.connect (handle_activate_chart);
 		group.insert (action);
 
 		action = new SimpleAction ("settings", null);
-		action.activate.connect (this.handle_activate_settings);
+		action.activate.connect (handle_activate_settings);
 		group.insert (action);
 
 		return group;
 	}
 
 	[DBus (visible = false)]
-	private void update_indicator_action () {
-		var visible = this.indicator_settings.get_boolean ("visible");
-		var current = this.source_settings.get_uint ("current");
-		var icon = get_icon (current);
-		Variant state;
-
-		if (icon != null) {
-			state = new Variant.parsed ("{ 'visible' : <%b>, 'icon' : %v }", visible, ((!) icon).serialize ());
-		} else {
-			state = new Variant.parsed ("{ 'visible' : <%b> }", visible);
+	public SimpleActionGroup get_action_group () {
+		if (action_group == null) {
+			action_group = create_action_group (get_indicator_action ());
 		}
 
-		get_indicator_action ().set_state (state);
+		return (!) action_group;
 	}
 
 	[DBus (visible = false)]
-	private SimpleAction get_indicator_action () {
-		if (this.indicator_action == null) {
-			var state = new Variant.parsed ("{ 'visible' : <false> }");
-			this.indicator_action = new SimpleAction.stateful ("indicator", null, state);
-			update_indicator_action ();
-		}
+	private void update_sources_menu () {
+		if (sources_menu != null) {
+			var menu = get_sources_menu ();
+
+			while (menu.get_n_items () > 0)
+				menu.remove (0);
+
+			var sources = get_sources ();
 
-		return (!) this.indicator_action;
+			for (var i = 0; i < sources.length; i++) {
+				var item = new MenuItem (sources[i].name, "indicator.current");
+				item.set_attribute (Menu.ATTRIBUTE_TARGET, "u", i);
+
+				var icon = sources[i].icon;
+				if (icon != null) {
+					item.set_icon ((!) icon);
+				}
+
+				menu.append_item (item);
+			}
+		} else {
+			get_sources_menu ();
+		}
 	}
 
 	[DBus (visible = false)]
-	public SimpleActionGroup get_action_group () {
-		if (this.action_group == null) {
-			this.action_group = create_action_group (get_indicator_action ());
+	private Menu get_sources_menu () {
+		if (sources_menu == null) {
+			sources_menu = new Menu ();
+			update_sources_menu ();
 		}
 
-		return (!) this.action_group;
+		return (!) sources_menu;
 	}
 
 	[DBus (visible = false)]
@@ -561,107 +333,12 @@ public class Indicator.Keyboard.Service : Object {
 	}
 
 	[DBus (visible = false)]
-	private string get_display_name (string layout) {
-		string? language = Xkl.get_language_name (layout);
-		string? country = Xkl.get_country_name (layout);
-		var has_language = language != null && ((!) language).get_char () != '\0';
-		var has_country = country != null && ((!) country).get_char () != '\0';
-
-		if (has_language && has_country) {
-			return @"$((!) language) ($((!) country))";
-		} else if (has_language) {
-			return (!) language;
-		} else if (has_country) {
-			return (!) country;
-		} else {
-			return "";
-		}
-	}
-
-	[DBus (visible = false)]
-	private void update_sources_menu () {
-		if (this.sources_menu != null) {
-			var menu = get_sources_menu ();
-
-			while (menu.get_n_items () > 0)
-				menu.remove (0);
-
-			VariantIter iter;
-			string type;
-			string name;
-
-			this.source_settings.get ("sources", "a(ss)", out iter);
-
-			for (var i = 0; iter.next ("(ss)", out type, out name); i++) {
-				if (type == "xkb") {
-					string? display_name;
-					string? layout_name;
-
-					this.xkb_info.get_layout_info (name, out display_name, null, out layout_name, null);
-
-					if (display_name != null) {
-						name = (!) display_name;
-					} else if (layout_name != null) {
-						name = get_display_name ((!) layout_name);
-					}
-				}
-				else if (type == "ibus") {
-					var names = new string[2];
-					names[0] = name;
-
-					var engines = get_ibus ().get_engines_by_names (names);
-
-					if (engines.length > 0) {
-						var engine = engines[0];
-						string? language = engine.get_language ();
-						string? display_name = engine.get_longname ();
-
-						if (language != null) {
-							language = Xkl.get_language_name ((!) language);
-						}
-
-						if (language != null && display_name != null) {
-							name = @"$((!) language) ($((!) display_name))";
-						} else if (language != null) {
-							name = (!) language;
-						} else if (display_name != null) {
-							name = (!) display_name;
-						}
-					}
-				}
-
-				var menu_item = new MenuItem (name, "indicator.current");
-				menu_item.set_attribute (Menu.ATTRIBUTE_TARGET, "u", i);
-
-				var icon = get_icon (i);
-				if (icon != null) {
-					menu_item.set_icon ((!) icon);
-				}
-
-				menu.append_item (menu_item);
-			}
-		} else {
-			get_sources_menu ();
-		}
-	}
-
-	[DBus (visible = false)]
-	private Menu get_sources_menu () {
-		if (this.sources_menu == null) {
-			this.sources_menu = new Menu ();
-			update_sources_menu ();
-		}
-
-		return (!) this.sources_menu;
-	}
-
-	[DBus (visible = false)]
 	public MenuModel get_menu_model () {
-		if (this.menu_model == null) {
-			this.menu_model = create_menu_model (get_sources_menu ());
+		if (menu_model == null) {
+			menu_model = create_menu_model (get_sources_menu ());
 		}
 
-		return (!) this.menu_model;
+		return (!) menu_model;
 	}
 
 	[DBus (visible = false)]
@@ -676,10 +353,7 @@ public class Indicator.Keyboard.Service : Object {
 
 	[DBus (visible = false)]
 	private void handle_changed_sources (string key) {
-		this.icon_string_subscripts = null;
-		this.icon_string_uniques = null;
-		this.icon_strings = null;
-		this.icons = null;
+		sources = null;
 
 		update_sources_menu ();
 		update_indicator_action ();
@@ -696,42 +370,29 @@ public class Indicator.Keyboard.Service : Object {
 
 	[DBus (visible = false)]
 	private void handle_activate_chart (Variant? parameter) {
-		var layout = "us";
+		string? layout = "us";
 		string? variant = null;
 
-		var current = this.source_settings.get_uint ("current");
-		var array = this.source_settings.get_value ("sources");
-
-		if (current < array.n_children ()) {
-			string type;
-			string name;
-
-			array.get_child (current, "(ss)", out type, out name);
-
-			if (type == "xkb") {
-				this.xkb_info.get_layout_info (name, null, null, out layout, out variant);
-			} else if (type == "ibus") {
-				var names = new string[2];
-				names[0] = name;
+		var sources = get_sources ();
+		var current = source_settings.get_uint ("current");
 
-				var engines = get_ibus ().get_engines_by_names (names);
-
-				if (engines.length > 0) {
-					var engine = engines[0];
-
-					layout = engine.get_layout ();
-					variant = engine.get_layout_variant ();
-				}
-			}
+		if (current < sources.length) {
+			layout = sources[current].layout;
+			variant = sources[current].variant;
 		}
 
+		var has_layout = layout != null && ((!) layout).get_char () != '\0';
+		var has_variant = variant != null && ((!) variant).get_char () != '\0';
+
 		try {
 			string command;
 
-			if (variant != null && ((!) variant).get_char () != '\0') {
-				command = @"gkbd-keyboard-display -l \"$layout\t$((!) variant)\"";
+			if (has_layout && has_variant) {
+				command = @"gkbd-keyboard-display -l \"$((!) layout)\t$((!) variant)\"";
+			} else if (has_layout) {
+				command = @"gkbd-keyboard-display -l $((!) layout)";
 			} else {
-				command = @"gkbd-keyboard-display -l $layout";
+				command = @"gkbd-keyboard-display -l us";
 			}
 
 			Process.spawn_command_line_async (command);
@@ -761,8 +422,8 @@ public class Indicator.Keyboard.Service : Object {
 
 	[DBus (visible = false)]
 	private void handle_name_lost (DBusConnection? connection, string name) {
-		((!) this.loop).quit ();
-		this.loop = null;
+		((!) loop).quit ();
+		loop = null;
 	}
 
 	[DBus (visible = false)]
diff --git a/lib/source.vala b/lib/source.vala
new file mode 100644
index 00000000..3e38a86e
--- /dev/null
+++ b/lib/source.vala
@@ -0,0 +1,441 @@
+/*
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: William Hua <william.hua@canonical.com>
+ */
+
+public class Indicator.Keyboard.Source : Object {
+
+	private static Gnome.XkbInfo? xkb_info;
+	private static IBus.Bus? bus;
+
+	private string? xkb;
+	private string? ibus;
+
+	private string? _name;
+	private string? _short_name;
+	private string? _layout;
+	private string? _variant;
+	private Icon? _icon;
+	private uint _subscript;
+	private bool _show_subscript;
+	private bool _use_gtk;
+
+	public string? name {
+		get { if (_name == null) { _name = _get_name (); } return _name; }
+	}
+
+	public string? short_name {
+		get { if (_short_name == null) { _short_name = _get_short_name (); } return _short_name; }
+	}
+
+	public string? layout {
+		get { if (_layout == null) { _layout = _get_layout (); } return _layout; }
+	}
+
+	public string? variant {
+		get { if (_variant == null) { _variant = _get_variant (); } return _variant; }
+	}
+
+	public Icon? icon {
+		get { if (_icon == null) { _icon = _get_icon (); } return _icon; }
+		private set { _icon = value; }
+	}
+
+	public uint subscript {
+		get { return _subscript; }
+		set { _subscript = value; icon = null; }
+	}
+
+	public bool show_subscript {
+		get { return _show_subscript; }
+		set { _show_subscript = value; icon = null; }
+	}
+
+	public bool use_gtk {
+		get { return _use_gtk; }
+		construct set { _use_gtk = value; icon = null; }
+	}
+
+	public Source (Variant variant, bool use_gtk = false) {
+		Object (use_gtk: use_gtk);
+
+		if (variant.is_of_type (new VariantType ("(ss)"))) {
+			unowned string type;
+			unowned string name;
+
+			variant.get ("(&s&s)", out type, out name);
+
+			if (type == "xkb") {
+				xkb = name;
+			} else if (type == "ibus") {
+				ibus = name;
+			}
+		} else if (variant.is_of_type (new VariantType ("a{ss}"))) {
+			VariantIter iter;
+			unowned string key;
+			unowned string value;
+
+			variant.get ("a{ss}", out iter);
+
+			while (iter.next ("{&s&s}", out key, out value)) {
+				if (key == "xkb") {
+					xkb = value;
+				} else if (key == "ibus") {
+					ibus = value;
+				}
+			}
+		}
+	}
+
+	private static Gnome.XkbInfo get_xkb_info () {
+		if (xkb_info == null) {
+			xkb_info = new Gnome.XkbInfo ();
+		}
+
+		return (!) xkb_info;
+	}
+
+	private static IBus.Bus get_bus () {
+		if (bus == null) {
+			IBus.init ();
+			bus = new IBus.Bus ();
+		}
+
+		return (!) bus;
+	}
+
+	private IBus.EngineDesc? get_engine () {
+		IBus.EngineDesc? engine = null;
+
+		if (ibus != null) {
+			var names = new string[2];
+			names[0] = (!) ibus;
+
+			var engines = get_bus ().get_engines_by_names (names);
+
+			if (engines.length > 0) {
+				engine = engines[0];
+			}
+		}
+
+		return engine;
+	}
+
+	protected virtual string? _get_name () {
+		string? name = null;
+
+		var engine = get_engine ();
+
+		if (engine != null) {
+			string? language = ((!) engine).get_language ();
+			string? display_name = ((!) engine).get_longname ();
+			var has_language = language != null && ((!) language).get_char () != '\0';
+			var has_display_name = display_name != null && ((!) display_name).get_char () != '\0';
+
+			if (has_language) {
+				language = Xkl.get_language_name ((!) language);
+				has_language = language != null && ((!) language).get_char () != '\0';
+			}
+
+			if (has_language && has_display_name) {
+				name = @"$((!) language) ($((!) display_name))";
+			} else if (has_language) {
+				name = language;
+			} else if (has_display_name) {
+				name = display_name;
+			}
+		}
+
+		var has_name = name != null && ((!) name).get_char () != '\0';
+
+		if (!has_name && xkb != null) {
+			string? display_name = null;
+			string? layout = null;
+
+			get_xkb_info ().get_layout_info ((!) xkb, out display_name, null, out layout, null);
+
+			var has_display_name = display_name != null && ((!) display_name).get_char () != '\0';
+			var has_layout = layout != null && ((!) layout).get_char () != '\0';
+
+			if (has_display_name) {
+				name = display_name;
+			} else if (has_layout) {
+				string? language = Xkl.get_language_name ((!) layout);
+				string? country = Xkl.get_country_name ((!) layout);
+				var has_language = language != null && ((!) language).get_char () != '\0';
+				var has_country = country != null && ((!) country).get_char () != '\0';
+
+				if (has_language && has_country) {
+					name = @"$((!) language) ($((!) country))";
+				} else if (has_language) {
+					name = language;
+				} else if (has_country) {
+					name = country;
+				}
+			}
+		}
+
+		if (name == null || ((!) name).get_char () == '\0') {
+			if (ibus != null) {
+				name = ibus;
+			} else if (xkb != null) {
+				name = xkb;
+			}
+		}
+
+		return name;
+	}
+
+	protected virtual string? _get_short_name () {
+		string? short_name = null;
+
+		if (xkb != null) {
+			get_xkb_info ().get_layout_info ((!) xkb, null, out short_name, null, null);
+		}
+
+		var has_short_name = short_name != null && ((!) short_name).get_char () != '\0';
+
+		if (!has_short_name) {
+			var engine = get_engine ();
+
+			if (engine != null) {
+				short_name = ((!) engine).get_name ();
+			}
+		}
+
+		if (short_name == null || ((!) short_name).get_char () == '\0') {
+			if (ibus != null) {
+				short_name = ibus;
+			} else if (xkb != null) {
+				short_name = xkb;
+			}
+		}
+
+		return abbreviate (short_name);
+	}
+
+	protected virtual string? _get_layout () {
+		string? layout = null;
+
+		if (xkb != null) {
+			get_xkb_info ().get_layout_info ((!) xkb, null, null, out layout, null);
+		}
+
+		var has_layout = layout != null && ((!) layout).get_char () != '\0';
+
+		if (!has_layout) {
+			var engine = get_engine ();
+
+			if (engine != null) {
+				layout = ((!) engine).get_layout ();
+			}
+		}
+
+		if (layout == null || ((!) layout).get_char () == '\0') {
+			layout = xkb;
+		}
+
+		return layout;
+	}
+
+	protected virtual string? _get_variant () {
+		string? variant = null;
+
+		if (xkb != null) {
+			get_xkb_info ().get_layout_info ((!) xkb, null, null, null, out variant);
+		}
+
+		var has_variant = variant != null && ((!) variant).get_char () != '\0';
+
+		if (!has_variant) {
+			var engine = get_engine ();
+
+			if (engine != null) {
+				variant = ((!) engine).get_layout_variant ();
+			}
+		}
+
+		if (variant == null || ((!) variant).get_char () == '\0') {
+			variant = null;
+		}
+
+		return variant;
+	}
+
+	private Gtk.StyleContext? get_style_context () {
+		Gtk.StyleContext? context = null;
+
+		if (_use_gtk) {
+			Gdk.Screen? screen = Gdk.Screen.get_default ();
+
+			if (screen != null) {
+				context = new Gtk.StyleContext ();
+				((!) context).set_screen ((!) screen);
+
+				var path = new Gtk.WidgetPath ();
+				path.append_type (typeof (Gtk.MenuItem));
+				((!) context).set_path (path);
+			}
+		}
+
+		return context;
+	}
+
+	protected virtual Icon? create_icon () {
+		Icon? icon = null;
+
+		var style = get_style_context ();
+
+		if (style != null) {
+			const int W = 22;
+			const int H = 22;
+			const int w = 20;
+			const int h = 20;
+			const double R = 2.0;
+			const double TEXT_SIZE = 12.0;
+			const double SUBSCRIPT_SIZE = 8.0;
+
+			Pango.FontDescription description;
+			var colour = ((!) style).get_color (Gtk.StateFlags.NORMAL);
+			colour = { 0.5, 0.5, 0.5, 1.0 };
+			((!) style).get (Gtk.StateFlags.NORMAL, Gtk.STYLE_PROPERTY_FONT, out description);
+
+			var surface = new Cairo.ImageSurface (Cairo.Format.ARGB32, W, H);
+			var context = new Cairo.Context (surface);
+
+			context.translate (0.5 * (W - w), 0.5 * (H - h));
+
+			context.new_sub_path ();
+			context.arc (R, R, R, Math.PI, -0.5 * Math.PI);
+			context.arc (w - R, R, R, -0.5 * Math.PI, 0);
+			context.arc (w - R, h - R, R, 0, 0.5 * Math.PI);
+			context.arc (R, h - R, R, 0.5 * Math.PI, Math.PI);
+			context.close_path ();
+
+			context.set_source_rgba (colour.red, colour.green, colour.blue, colour.alpha);
+			context.fill ();
+			context.set_operator (Cairo.Operator.CLEAR);
+
+			if (short_name != null) {
+				var text_layout = Pango.cairo_create_layout (context);
+				text_layout.set_alignment (Pango.Alignment.CENTER);
+				description.set_absolute_size (Pango.units_from_double (TEXT_SIZE));
+				text_layout.set_font_description (description);
+				text_layout.set_text ((!) short_name, -1);
+				Pango.cairo_update_layout (context, text_layout);
+				int text_width;
+				int text_height;
+				text_layout.get_pixel_size (out text_width, out text_height);
+
+				if (_show_subscript) {
+					var subscript_layout = Pango.cairo_create_layout (context);
+					subscript_layout.set_alignment (Pango.Alignment.CENTER);
+					description.set_absolute_size (Pango.units_from_double (SUBSCRIPT_SIZE));
+					subscript_layout.set_font_description (description);
+					subscript_layout.set_text (@"$_subscript", -1);
+					Pango.cairo_update_layout (context, subscript_layout);
+					int subscript_width;
+					int subscript_height;
+					subscript_layout.get_pixel_size (out subscript_width, out subscript_height);
+
+					context.save ();
+					context.translate ((w - (text_width + subscript_width)) / 2, (h - text_height) / 2);
+					Pango.cairo_layout_path (context, text_layout);
+					context.fill ();
+					context.restore ();
+
+					context.save ();
+					context.translate ((w + (text_width - subscript_width)) / 2, (h + text_height) / 2 - subscript_height);
+					Pango.cairo_layout_path (context, subscript_layout);
+					context.fill ();
+					context.restore ();
+				} else {
+					context.save ();
+					context.translate ((w - text_width) / 2, (h - text_height) / 2);
+					Pango.cairo_layout_path (context, text_layout);
+					context.fill ();
+					context.restore ();
+				}
+			}
+
+			var buffer = new ByteArray ();
+
+			surface.write_to_png_stream ((data) => {
+				buffer.append (data);
+				return Cairo.Status.SUCCESS;
+			});
+
+			icon = new BytesIcon (ByteArray.free_to_bytes ((owned) buffer));
+		}
+
+		return icon;
+	}
+
+	private Icon? _get_icon () {
+		Icon? icon = null;
+
+		var engine = get_engine ();
+
+		if (engine != null) {
+			string? icon_name = ((!) engine).get_icon ();
+			var has_icon_name = icon_name != null && ((!) icon_name).get_char () != '\0';
+
+			if (has_icon_name) {
+				try {
+					icon = Icon.new_for_string ((!) icon_name);
+				} catch (Error error) {
+					warning ("error: %s", error.message);
+				}
+			}
+		}
+
+		if (icon == null && short_name != null) {
+			string icon_name;
+
+			if (_show_subscript) {
+				icon_name = @"indicator-keyboard-$((!) short_name)-$_subscript";
+			} else {
+				icon_name = @"indicator-keyboard-$((!) short_name)";
+			}
+
+			if (_use_gtk) {
+				var icon_theme = Gtk.IconTheme.get_default ();
+				Gtk.IconInfo? icon_info = icon_theme.lookup_icon (icon_name, 22, 0);
+
+				if (icon_info != null) {
+					string? file_name = ((!) icon_info).get_filename ();
+					var has_file_name = file_name != null && ((!) file_name).get_char () != '\0';
+
+					if (has_file_name) {
+						try {
+							icon = Icon.new_for_string ((!) file_name);
+						} catch (Error error) {
+							warning ("error: %s", error.message);
+						}
+					}
+				}
+			} else {
+				icon = new ThemedIcon (icon_name);
+			}
+		}
+
+		if (icon == null) {
+			icon = create_icon ();
+		}
+
+		return icon;
+	}
+}